6647646079 has 2 divisors, whose sum is σ = 6647646080. Its totient is φ = 6647646078.

The previous prime is 6647646073. The next prime is 6647646157. The reversal of 6647646079 is 9706467466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6647646079 - 2⁷ = 6647645951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6647646073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323823039 + 3323823040.

It is an arithmetic number, because the mean of its divisors is an integer number (3323823040).

Almost surely, 2^6647646079 is an apocalyptic number.

6647646079 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647646079 is an equidigital number, since it uses as much as digits as its factorization.

6647646079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9144576, while the sum is 55.

The square root of 6647646079 is about 81533.0980583959. The cubic root of 6647646079 is about 1880.2804469772.

The spelling of 6647646079 in words is "six billion, six hundred forty-seven million, six hundred forty-six thousand, seventy-nine".